Compact. Configurable Golf Club Set

ABSTRACT

Compact golf club set configurable during game play at player discretion prior to shot play, comprising:
         Adjustable-length shaft  100  in discrete length positions  165  in telescoping handle  110 ; adjustable-length shaft  100  including head interchange mechanism  170;      Interchangeable head  200, 300, 400  in adjustable-length shaft  100 , with fixed loft head options  201, 301, 401 ; adjustable loft heads  202, 302  incorporating adjustable loft mechanism  500   a   , 500   b , and sole  504  whose geometry  545  keeps adjustable loft heads  202, 302  horizontal on the ground;   Interchangeable fixed or adjustable loft head, encompassing:   Wood heads  200 : 1-wood  210 , fairway woods  220 , and hybrids;   Iron heads  300 : 1- to 9-irons  310, 320  and wedges  330 ; and/or   putter head  400.

TECHNICAL FIELD

Field of application is a compact, configurable golf club set. The club set in this invention allows for adjustment of basic club characteristics, enabling players to adjust clubs to their strokes by varying the shaft length, interchanging heads on said shaft and/or modifying the head loft angle. As with any standard club set, the compact set in this invention comprehensively encompasses shafts, woods, irons and putter.

BACKGROUND ART

In traditional golf clubs, heads and shafts are fixed. As such, the wide variety of shots used during a game requires a wide variety of shafts and heads. In golf clubs, a defining head characteristic is the loft angle or angle at which the ball is hit: acute angles for short, precise distances, right angles for longer distances. As in the case of heads, shaft length and flexibility vary with distance of shot: short, stiff shafts for short distances, longer, more flexible shafts for longer distances.

Woods and hybrids are designed for tee-off (designated area from which players take their first shot) or fairway (zone extending from the tee to the putting green) strokes. Loft angles normally vary from 8° to 28°. Depending on player style, they can assemble a set of some five heads of this type in the bag. Woods are classified as 1-wood or driver with 8° to 13° loft angles, 2-wood with 12° to 15° loft angles, and all the way to 7-wood with 25° to 28° loft angles. Although woods rise all the way to 15-wood, few players use them. Two-woods and up are also known as fairway woods. Hybrids have the appearance of wood with a lower profile or head height, with angles similar to 5- or 7-wood. Some hybrids have more acute angles, such as the equivalent to a 5-iron with about 28°. The length of a 1-wood club, based on an adult of average height, ranges from 43 to 45 inches (109 to 114 cm). Length decreases progressively one half to one inch (1.27 to 2.54 cm) as club numbers rise to 7-wood, with an approximate length of 41 inches (104 cm).

Irons and wedges (irons of very acute loft angles) are intended for mid-distance and approach shots. In most of these, loft angle varies from 15° to 62° and, depending on player preference, they make up a selection of about nine clubs in the bag. Irons range from 1 to 9. Number 1 is equivalent to loft angles of 15° to 18°, increasing gradually through number 9, equivalent to loft angles of 45° to 48°. Wedges include pitch wedge (47° to 53°), gab wedge (50° to 54°), sand wedge (54° to 58°) and lob wedge (58° to) 62°. The length of a 1-iron club, based on an adult of average height, varies at about 40 inches (102 cm). Length decreases progressively by a half-inch (1.27 cm) as club numbers rise to 9-iron at some 36 inches (91 cm). Wedge shaft lengths are about 35 inches (89 cm).

Putters are used for putting green strokes intended to put the ball in the hole. There is a large variety of heads, with loft angles from 2° to 5°. Players choose the putter best suited to their game and put a single club of this type in the bag. While lengths vary widely, the most conventional and therefore most often used stands at about 35 inches (89 cm).

Golf rules allow for a maximum of 14 clubs in the bag.

Other relevant criteria to be considered by players include shaft flexibility and dynamic or swing weight, equivalent to the concept of club moment of inertia. Moment of inertia is determined by shaft length and head weight.

All of these elements make up the range of features to be considered by players when choosing an ideal set of clubs, a concept that varies from player to player.

The novelty in this innovation lies in the combination of related functionalities in a golf device featuring a compact, configurable format emulating the performance of a complete standard club set.

The state of the art on configurable or adjustable clubs includes attempts that do not address issues in a comprehensive manner and whose technical elements do not consider the aspects of the game addressed by conventional or standard club sets.

The literature on patents and applications totally or partially addressing the scope of this invention is extensive. Our prior art review focuses on patents that have attempted to address issues in a comprehensive manner and on mechanisms most closely resembling this invention.

The problem underlying the previous patents cited here are that proposed designs have failed to achieve one or more of the following conditions:

-   -   a) They do not allow for shaft length adjustment and therefore         do not reduce the number of shafts, or else they do not adjust         the shaft length for various shot distances, U.S. Pat. No.         4,253,666.     -   b) They do not provide a range of heads suitable for most shots.         As noted, modern golf requires a series of head types: woods,         hybrids, irons, wedges and putters; U.S. Pat. No. 4,253,666,         U.S. Pat. No. 2,091,794.     -   c) They do not provide a head loft angle adjustment mechanism.         This forces the use of numerous heads, decreasing the advantages         of this type of set over a standard set, U.S. Pat. No.         6,547,673, U.S. Pat. No. 4,253,666.     -   d) Head loft angle adjustment mechanisms that do not address the         sole adjustment required to attain proper horizontal rest of         head on the ground for the various adjusted loft angles, U.S.         Pat. No. 5,083,779, U.S. Pat. No. 2,091,794.     -   e) Adjustment mechanisms of limited scope whose advantages over         a conventional set are marginal. These include adjustable sets         requiring a large number of components or parts, similar to the         requirements of a standard club set, U.S. Pat. No. 6,547,673. Or         conversely, adjustment mechanisms that reduce the number of         components but do not cover the full range of play in a standard         club set, U.S. Pat. No. 5,083,779, U.S. Pat. No. 4,253,666, U.S.         Pat. No. 2,091,794.     -   f) Coupling or adjustment mechanisms with an important potential         for fracture and/or misadjustment and mechanisms whose basic         design includes high-stress areas. All mechanisms in woods,         hybrids, irons or wedges, whether in the shaft or head, are         subject to high dynamic stress as shots are played. Materials         fatigue in high-stress areas will most certainly increase with         stroke repetition, especially considering that with a compact or         reduced set all shots are played with fewer clubs and/or heads.         As such, clubs and/or heads and associated mechanisms take a         greater number of shots per round than standard set clubs.         Inappropriate adjustment increases dynamic load and the         potential for connection or adjustment mechanism failure, U.S.         Pat. No. 6,547,673, U.S. Pat. No. 5,083,779, U.S. Pat. No.         4,253,666, U.S. Pat. No. 2,091,794.     -   g) Configuration mechanisms that do not allow for easy or rapid         handling prior to a shot. Examples include screw-on shaft-head         connectors, U.S. Pat. No. 7,207,897.

Toothed pieces for setting loft angle with discrete positions that do not necessarily set the positions or angles desired by player. In addition, many such schemes need excessive manipulation requiring release, position setting and locking schemes, U.S. Pat. No. 5,083,779, U.S. Pat. No. 2,091,794.

Connection mechanisms whose basic design concept does not allow for tight coupling, a key issue considering that such couplings are to be performed by players on the course prior to shot play. The results are connection mechanisms that are not easily adjusted and give the feeling of playing with loose pieces, U.S. Pat. No. 6,547,673, U.S. Pat. No. 5,083,779, U.S. Pat. No. 4,253,666, U.S. Pat. No. 2,091,794.

The basic design concept of mechanisms in this invention include adjustments and/or couplings that can be quickly performed and provide inter-piece tolerances based on compression of pieces of robust basic trigonometry. All mechanisms seek to balance aesthetics and weight and avoid high-stress areas leaving pieces susceptible to early fracture or deterioration due to materials fatigue.

Proper adjustment consists of choosing the right head and loft angle and a shaft length consistent with the selected head. Such adjustments should be easily done by any player prior to shot play, within the allotted timeframe. The result should be a solidly assembled club equivalent to a standard club.

SUMMARY OF INVENTION Technical Problem

In traditional golf clubs, heads and shafts are fixed. As such, the wide range of shots used during a game requires a wide variety of shafts and heads. This forces players to carry a club set of considerable weight and volume.

As the game takes places over several hours and distances of more than 10 km for an 18-hole course, carrying a full complement of golf clubs requires significant effort.

This is also an issue when transporting bags in a vehicle. Club houses help, but this remains a problem when playing at more than one golf course, especially if more than one family member practices the sport. Another aspect of the problem are players who travel frequently on business. Such players have only the option of lugging their equipment or using rentals. The first option is particularly inconvenient when flying, while the second is often less than a pleasant experience as equipment may not fit the player or be deteriorated by use.

An additional point in the problem resulting from the use of traditional fixed heads and shafts is that available equipment often comes in standard lengths and loft angles. As the purpose of the game is to complete a round using the fewest strokes possible, equipment is key, especially how well clubs can accommodate player strokes. However, players have different trunks, arm lengths, etc. Especially difficult is the case of growing children. Significant numbers of children practice the sport but must play with clubs that do not match their build or must be replaced or modified as they grow.

As noted in the Background Art, the state of the art on configurable or adjustable clubs includes attempts that do not address the problem in a comprehensive manner and whose technical elements do not consider the aspects of the game addressed by conventional or standard club sets. Partial solutions addressing various adjustment elements exhibit the technical deficiencies noted in the Background Art, resulting in most players still preferring fixed-configuration standard club sets.

Proper adjustment consists of choosing the right head and loft angle and a shaft length consistent with the selected head. Such adjustments should be easily done by any player, whether a child, adult or senior, prior to shot play and within the allotted timeframe. Lastly, the required club needs solid adjustment mechanisms not subject to premature fracture or wear. This is especially important when considering that all shots in a game could be played using one or two clubs.

Solution to Problem

The novelty in this innovation lies in the combination of related functionalities in a golf device featuring a compact, configurable format emulating the performance of a complete standard club set.

The first functionality is that, as with a conventional club set, the compact, configurable set in this invention can include wood drivers, fairway woods, hybrids and irons, totally or partially encompassing 1 to 9, wedges and putters.

The second functionality is that each of these head types can vary their loft angle by means of a mechanism such that the full range of loft angles is adequately covered. This does not prevent extending beyond the conventional head loft angle range or defining heads with more targeted loft angle ranges. The latter requires a larger number of heads in the compact set, but it has the advantage that head behavior more closely resembles conventional head behavior, for example in terms of weight and therefore moment of inertia or swingweight behavior. The adjustable loft works by means of a mechanism attached to the rear area of the head and joined to a modified hosel. It has the shape of a triangle one of whose sides can be manually adjusted by means of a screw.

The second functionality means that the game can be played using a reduced number of heads that can be interchanged, preferably on one or a reduced number of shafts.

The above leads to the third functionality in this invention. As the proposition is to play the game using one or a reduced number of shafts, these heads and shafts contain an interchange mechanism that can be easily and comfortably used by players to assemble a club prior to a stroke. A single shaft is to be preferred, but a player wishing to use a shaft for woods and another for irons would find no restriction for including two shafts instead of one in the compact set. In such a case, both shafts would include a head interchange mechanism. The head interchange mechanism consists of a guide pin attached to the hosel which is then coupled to a pair of concentric cylinders on one end of the shaft and which contain balls that lock the mechanism by lodging in the recesses of said guide pin. The mechanism is operated by the player using his fingers to move the outermost cylinder.

A fourth functionality is that since the proposition is to play the game using one or a reduced number of shafts, their length must be adjustable per the selected head and loft angle. The shaft length adjustment mechanism consists of a shaft with surface recesses housing a sliding handle, which in turn houses a pair of concentric cylinders on one end of said handle and which contain balls that lock the mechanism by lodging in the recesses of said shaft. The mechanism is operated by the player using his fingers to move the outermost cylinder.

A fifth functionality is that since the head loft angle changes, the head should preferably contain a modified sole so as to ensure correct lie (horizontal head rest on ground) for the range of loft angles defined for this head.

A sixth functionality is that head interchange mechanism allows for the use of any commercially available head with a standard hosel. This permits using the adjustable compact set with conventional, commercially available heads of the player's choosing; for example putter and/or 1-wood or driver type heads. The hosel is construed to be the socket or neck in the head of a golf club into which a shaft is inserted.

Advantageous Effects of Invention

All issues described in the preceding chapter are addressed and solved in this invention and constitute its advantage. Chief among these issues are:

Despite significantly reducing volume and weight, the adjustable compact set behaves in a manner that is at least equivalent to a conventional club set.

At player discretion, the compact set can be used with commercially available fixed heads. This is especially useful for 1-wood heads and putters, as players tend to be loyal to certain models, notably putters.

Assembling an adjustable club is simple and requires at most three steps: (a) choose a head and shaft and connect them; (b) adjust loft angle, assuming an adjustable loft head, and (c) adjust shaft length. These mechanisms are easily operated by players using their fingers.

Once adjustments are made, connectors are designed to remain firmly coupled during shot play, giving players the sensation of a solid club and stroke.

With this new device players can, during game play, adjust the device to their build and style of play, opening up the possibility of more precise shots. This is one of the key objectives of the game of golf: greater precision means fewer strokes are needed to complete a round.

The device also helps golfers improve their game, as it allows for numerous variations for a given shot. Players can choose the combination best suited in terms of precision and/or distance and the device stays with them as their game evolves.

The adjustable set presents a clear advantage for children, since as a configurable device, it adapts to their physical development.

The set significantly reduces standard club set volume and weight by ⅕ and ⅓ respectively, providing the benefits below:

A much more pleasant game experience, as players can play a round with one or two clubs and avoid carrying a heavy, voluminous bag for several hours over great distances: 10 km on average for 18 holes.

This may be especially relevant to the older players who represent such a significant portion of the player population.

The adjustable compact set requires significantly less space and can be easily carried by car or airplane, which is especially convenient if more than one family member practices the sport. Carrying a standard club set to distant destinations is often not feasible due to space or cost considerations. The only options are storing a standard club set at each golf course frequented or resorting to rentals or loans. These examples do not apply to the adjustable compact set, which holds the significant advantage of allowing players to always use the same device at all locations, since as noted, space or cost considerations would no longer be a concern.

BRIEF DESCRIPTION OF DRAWINGS

This disclosure is to be read based on the detailed description and drawings briefly described below.

FIG. 1 shows a compact, configurable golf club set, including adjustable-length shaft 100 and three types of interchangeable heads: putter 400, irons 300 and woods 200. Each of said heads can be of fixed or adjustable loft

FIG. 2 shows a compact, configurable golf club set with supported head types as an alternative set of parts making up a pair of configurable clubs, where said parts include two adjustable-length shafts 100; a stiffer one for iron and putter heads and a more flexible one for wood heads. Six interchangeable heads, including an interchangeable putter head 400, three interchangeable iron heads 300 encompassing from long irons 310 to short and mid-irons 320, 330 and two interchangeable wood heads 200 covering 1-wood or driver 210 and fairway woods 220. Each of said heads can be of fixed or adjustable loft.

FIG. 3 shows shaft 160 described by its three sections: (a) head interchange section 161, which for the effects of this patent is the section supporting head interchange mechanism 170; (b) conical transition section 162 between head interchange section 161 and adjustable-length section 163; and (c) the said adjustable-length section 163 or else a section of the shaft where telescoping mechanism 130 of shaft 160 is slid and/or attached.

FIG. 4 shows shaft butt section 166 representing a close-up cross-section of the end of adjustable-length section 163, shaft dents 165 for attaching telescoping mechanism 130, and a detailed view of shaft butt end 167 lodged at the end of shaft 160.

FIG. 5 shows telescoping handle 110 with telescoping mechanism 130 attached by means of a cylinder forming handle core 122 with grip 121 over it.

FIG. 6 shows telescoping mechanism 130 attached to handle core 122 and coupled to adjustable-length section 163.

FIG. 7 shows an exploded view of telescoping mechanism 130 and parts forming said mechanism.

FIG. 8 shows a cross-section of telescoping mechanism in locked position 131 with ball lock elements 138 inserted into shaft dents 165 of adjustable-length section 163.

FIG. 9 shows a cross-section of telescoping mechanism in unlocked position 132 with ball lock elements 138 released by means of unlock recesses 135 on the inner surface of external telescoping cylinder 134.

FIG. 10 shows a general view of head interchange mechanism 170 attached to shaft 160. Pin lock 173 is shown inserted into said mechanism.

FIG. 11 shows an exploded view of head interchange mechanism 170 and parts forming said mechanism.

FIG. 12 shows a cross-section of head interchange mechanism in coupled position 171 with pin lock 173 inserted and locking balls 183 secured in pin lock dents 175.

FIG. 13 shows a cross-section of head interchange mechanism in uncoupled position 172 with pin lock 173 released and locking balls 183 released by means of decoupling recesses 188 on the inner surface of external interchange cylinder 187.

FIG. 14 shows interchangeable fixed-loft putter head 401 with pin lock 173 aligned for insertion in standard hosel 199. Figure to the right shows pin lock 173 inserted and attached to standard hosel 199 of said putter head.

FIG. 15 shows interchangeable fixed loft iron head 301 with pin lock 173 aligned for insertion in standard hosel 199. Figure to the right shows pin lock 173 inserted and attached to standard hosel 199 of said iron head.

FIG. 16 shows interchangeable fixed-loft wood head 201 with pin lock 173 aligned for insertion in standard hosel 199. Figure to the right shows pin lock 173 inserted and attached to standard hosel 199 of said wood head.

FIG. 17 shows a bottom view of sole 504 for adjustable-loft iron head 302, with three lines along sole 552 defining the bottom volume section of said head and which as a result generate the surface of modified sole geometry 545.

FIG. 18 shows an A-A section of less acute loft angle end 550, 548. For an adjustable-loft iron head 302, with less acute loft angle end 548, for the range of loft angles defined for said head, and attaching the head to the horizontal 551, and which therefore defines in respect of ground 549 the line along sole 552 defining the scan section of modified sole geometry 545, closer to the lower vertex of club head face 506.

FIG. 19 shows an A-A section of intermediate loft angle 550, 547. For an adjustable-loft iron head 302, with intermediate loft angle 547, for the range of loft angles defined for said head, and attaching the head to the horizontal 551, and which therefore defines in respect of ground 549 the line along sole 552 defining the intermediate scan section of modified sole geometry 545.

FIG. 20 shows an A-A section of more acute loft angle end 550, 548. For an adjustable-loft iron head 302, with more acute loft angle end 548, for the range of loft angles defined for said head, and attaching the head to the horizontal 551, and which therefore defines in respect of ground 549 the line along sole 552 defining the scan section of modified sole geometry 545, more distant relative to the lower vertex of club head face 506.

FIG. 21 shows the adjustable loft mechanism, iron head version, side view 500 a. The side view highlights a triangle with vertices 511 a, 512 a, 513 a and legs or rods 514 a, 515 a. By adjusting the size of one of said rods, first connecting rod 514 a allows modification of said triangle and as such modification of loft angle 509 a.

FIG. 22 shows an adjustable-loft iron head, front view 302. Showing on heel side 508 a is hosel section 533 a in male hosel protrusion 535 a version, compatible with head interchange mechanism 170.

FIG. 23 shows the adjustable loft mechanism, iron head version, exploded view of screw 516 a and its supports or bearings, including bearing nut cylinder 526 a and bearing cylinder 524 a. The latter matches third vertex pivot 513 a and is supported by a pair of third vertex pivot brackets 541 a extending from joined connecting rod 540 a.

FIG. 24 shows the adjustable loft mechanism, iron head version, rear view 500 a. Note hosel loft axis 532 a supported by three pivot brackets 529 a, 530 a and hosel loft axis 532 a attached to joined connecting rod 540 a and how this connects to screw 516 a by means of bearing cylinder 524 a. Screw 516 a is screwed into bearing nut cylinder 526 a supported by a pair of first vertex pivot brackets 531 a extending from the top of rear of face 502 a.

FIG. 25 shows the adjustable loft mechanism, iron head version, general exploded view 500 a. Showing are two alternatives for hosel loft axis 532 a with variants in hosel section 533 a, the first as female hosel protrusion 534 a and the second as male hosel protrusion 535 a compatible with head interchange mechanism 170. Hosel loft axis 532 a shows a section displacing its axis by means of offset section 536 a. Hosel loft axis 532 a, in particular loft axis section 537 a, is supported by three pivot brackets 529 a, 530 a extending from the bottom of the rear of face 502 a. Said loft axis section 537 a is attached by means of male shape 538 a to joined connecting rod 540 a. They lock into position by means of parallel eccentric pin 539 a.

FIG. 26 shows the adjustable loft mechanism, wood head version, side view 500 b. The side view shows a triangle with vertices 511 b, 512 b, 513 b and legs or rods 514 b, 515 b. By adjusting the size of one of said rods, first connecting rod 514 b allows modification of said triangle and as such modification of loft angle 509 b.

FIG. 27 shows an adjustable-loft wood head, front view 202. Showing on heel side 508 b is hosel section 533 b in male hosel protrusion 535 b version compatible with head interchange mechanism 170.

FIG. 28 shows the adjustable loft mechanism, wood head version, exploded view of screw 516 b and its supports or bearings, including bearing cylinder 524 b and bearing nut cylinder 526 b. The latter matches third vertex pivot 513 b and Is supported by a pair of third vertex pivot brackets 541 b extending from joined connecting rod 540 b.

FIG. 29 shows the adjustable loft mechanism, wood head version, rear view 500 b. Note hosel loft axis 532 b supported by three pivot brackets 529 b, 530 b and said hosel loft axis 532 b attached to joined connecting rod 540 b, and how the latter connects to screw 516 b by means of bearing cylinder 524 b. Screw 516 b is screwed in bearing nut cylinder 526 b supported by a pair of third vertex pivot brackets 541 b.

FIG. 30 shows the adjustable loft mechanism, wood head version, general exploded view 500 b. Showing are two alternatives for hosel loft axis 532 b, with variants in hosel section 533 b, the first as female hosel protrusion 534 b and the second as male hosel protrusion 535 b, compatible with head interchange mechanism 170. Hosel loft axis 532 b, in particular loft axis section 537 b, is supported by three pivot brackets 529 b, 530 b extending from bottom and back of head. Said loft axis section 537 b is attached by means of male shape 538 b to joined connecting rod 540 b. They lock into position by means of parallel eccentric pin 539 b.

DESCRIPTION OF EMBODIMENTS

The compact golf club set configurable at player discretion prior to shot play shown in FIGS. 1-2. In preferred mode, it comprises at least adjustable-length shaft 100 in multiple discrete length positions 165, enabled by telescoping handle 110 as shown on FIGS. 3-5. Said adjustable-length shaft 100 includes head interchange mechanism 170 enabling connection of at least interchangeable head 200, 300, 400. Said interchangeable head has options for:

a) interchangeable fixed-loft heads 201, 301, 401, shown in detail in FIGS. 14-16; b) adjustable loft interchangeable heads 202, 302 with adjustable loft mechanism 500 a, 500 b and sole 504 whose geometry 545 keeps said adjustable loft heads 202, 302 horizontal on the ground for each adjusted loft angle 509 a, 509 b. The preferred adjustable loft mechanism is shown in FIGS. 21-25 for irons and 26-30 for woods.

In this invention, interchangeable head means both fixed and adjustable loft types and/or combinations thereof:

a) wood heads 200: 1-wood or driver 210, fairway 2-woods hereinafter 220, and hybrids; b) iron heads 300: 1- to 9-irons 310, 320 and wedges 330: pitch, gab, sand and lob wedges; c) putter heads 400.

EXAMPLES

The compact golf club set configurable during game play allows for numerous combinations to be defined by manufacturer and player preference. Examples 1-2 show two possible configurations in detail.

Example 1

Example 1 in FIG. 1 shows a compact set comprising a shaft and three heads:

Adjustable-length shaft 100; Interchangeable fixed loft 401 putter head 400; Interchangeable adjustable loft 302 iron head 300 that can be built for 5- to 9-irons to sand wedge loft angles; and Interchangeable wood head 200 that may be of fixed-loft angle 201 or an alternative to adjustable loft 202 that can be built for loft angles ranging from 1- to 7-wood heads.

This example illustrates a highly compact four-piece set of interest to players wishing to significantly reduce weight and volume over a standard 14-club set and bag.

Players wishing to closely match a complete 14-club set need only increase the number of elements in their compact, configurable golf club set. As would a pro, players need to choose the elements to be used in the course. Example 2 covers this case.

Example 2

Example 2 in FIG. 2 illustrates an eight-piece set consisting of two shafts and six heads: a putter head, two adjustable-loft iron heads, an adjustable-loft wedge head, a fixed-loft wood driver and an adjustable-loft fairway wood, as follows:

Two adjustable-length shafts 100, including a more flexible shaft allowing interchangeable wood heads 200 to cover longer distances, and a stiffer shaft for interchangeable iron heads 300 and interchangeable putter heads 400; A fixed-loft putter head 401; An adjustable-loft iron head 302 that could be developed to cover average weight and loft angles for 4- to 6-iron head set 310; An adjustable-loft iron head 302 that could be developed to cover average weight and loft angles for 7- to 9-iron head set 320; An adjustable-loft iron head 302 that could be developed to cover average weight and loft angles for pitch wedge to lob wedge set 330; A fixed-loft wood head 201 equivalent to 1-wood or driver head 210; and An adjustable-loft wood head 202 that could be developed to cover average weight and loft angles for 3- to 7-fairway woods head set 220.

Weight is part and parcel of head design and construction criteria. Heavier heads generate greater moment of inertia or swingweight. For the sake of simplicity during game play, one way to vary the moment of inertia in this invention is to replace different weight heads on the shaft. Another way is to modify shaft length. This invention suggests that adjustable loft heads be designed with a weight near the average for the range of heads whose loft is to be emulated.

Examples 1-2 Detailed Element Description

Below is a detailed description of the parts and pieces comprising the compact, configurable golf club set and on which examples 1-2 are based, as follows:

-   (a) Description of adjustable-length shaft; -   (b) Description of interchangeable heads with adjustable loft     mechanism, with details on the corresponding sole; -   (c) Description of head interchange mechanism, including use of     interchangeable fixed-loft heads with the compact set; -   (d) Details on the telescoping mechanism; and -   (e) Description of the use of the compact, configurable golf club     set.

Adjustable-Length Shaft.

Adjustable-length shaft 100 is described below. Length of said shaft can be adjusted in multiple discrete positions 165 by means of telescoping handle 110. Said shaft includes head interchange mechanism 170. As shown on FIGS. 3-5, adjustable-length shaft 100 consists of the following elements:

a) Shaft 160, in turn comprising the following sections: a.1) Head interchange section 161, comprising during-play head interchange mechanism 170 located at the head connector end; a.2) Adjustable-length section 163 defined by a constant cross-section which defines adjustment surface 168 and whose end comprises shaft butt section 166 used to attach shaft butt end 167; a.3) Transition section 162 connecting head interchange section 161 to adjustable-length section 163. b) Telescoping handle 110, in turn comprising: b.1) Handle core 122, comprising a hollow, circular section tube such that its internal diameter matches the external diameter of shaft butt end 167 attached to the shaft butt section of shaft 166; b.2) Attached to one end of handle core 122 is an interference locking/unlocking telescoping mechanism 130, where the locking function consists of at least one lock element 138 tightly entering one of multiple discrete length positions 165 on the surface of adjustable-length section 163; b.3) Also attached to handle core 122 is a rubber, leather or cork grip 121 by which player holds telescoping handle 110 and thus adjustable-length shaft 100.

Adjustable Loft Mechanism.

Described below are interchangeable heads 200, 300 with adjustable loft mechanism 500 a, 500 b. The preferred adjustable-loft iron head 302 version is described in FIGS. 21-25. The preferred adjustable-loft wood head 202 version is described in FIGS. 26-30, and the preferred version of the sole of an adjustable loft head is described in FIGS. 17-20.

The compact, configurable golf club set in FIGS. 1-2 also calls for interchangeable heads 200, 300 with adjustable loft mechanism 500 a, 500 b in FIGS. 21-25 and 26-30, which comprise:

a) A club head face 506, 506 a, 506 b whose back supports adjustable loft mechanism 500, 500 a, 500 b during game play. b) Hosel loft axis 532 a, 532 b, comprising: b.1) Hosel section 533 a, 533 b connecting to adjustable-length shaft 100. This is either female hosel protrusion 534 a, 534 b or male hosel protrusion 535 a, 535 b. The latter is compatible with head interchange mechanism 170; b.2) Loft axis section 537 a, 537 b holding adjustable loft mechanism 500 a, 500 b; b.3) Offset section 536 a connecting loft axis section 537 a, 537 b to hosel section 533 a, 533 b on heel side 508 a, 508 b, a term defined as the horizontal end of club head face 506 a, 506 b closest to shaft 160. c) Modified sole geometry 545, with a scan section defined by at least three sections 550 where each contains a line along sole 552 cutting across the head volume. Each line is defined when the head rests horizontally 551 on the ground 549 in front of the ball, in position to contact club head face 506, for at least three adjusted loft angles, one intermediate loft angle 547 and two loft angle ends 548 corresponding to loft angles for the range of heads corresponding to the adjustable head. Modified sole geometry 545 is described in FIGS. 17-20.

For adjustable loft mechanism head 500 with a standard sole, the steeper the loft angle 547, 548, the greater the deviation relative to the horizontal 551 defined by ground 549. The modified sole geometry 545, FIG. 17, allows horizontally supporting the head on the ground as head loft angle is increased with adjustable loft mechanism 500. Drawing successive soles, FIGS. 18-20, for successive loft angles 547, 548, where soles 504 keep the club head face 506 parallel to the horizontal 551 relative to ground 549, yields modified sole geometry 545. While said adjustable loft mechanism 500 allows for continuous loft angles, to compensate for or adjust the geometry of sole 504 this invention proposes at least three angles: loft angle ends 548 or the adjustable loft mechanism design limits, and an intermediate loft angle 547. Other configurations can be interpolated and applied on the sole face by means of a scan section, thus providing a continuous surface approaching the full range of angles defined in said adjustable loft mechanism 500. In this invention, this sole configuration is referred to as modified sole geometry 545.

The above adjustable loft mechanism 500 a, 500 b shown on FIGS. 21 and 26 comprises three vertices forming a triangular configuration joined to an adjustable loft mechanism head. Changing vertex angles and/or triangle side length modifies head loft angle 509 a, 509 b. The preferred configuration is shown as two adjustable vertices or pivots and a vertex joined to loft axis section 537 a, 537 b. The latter transfers the adjustable angle from the head to the shaft and thus allows loft angle adjustment 509 a, 509 b. The first vertex pivot 511 a, 511 b is joined to the head body. The second vertex is fixed 512 a, 512 b, matching and joined to loft axis section 537 a, 537 b. The third vertex pivot 513 a, 513 b is the intersection of first connecting rod 514 a, 514 b extending from the first vertex pivot 511 a, 511 b and second connecting rod 515 a, 515 b extending from second joint vertex 512 a, 512 b. As such, second connecting rod 515 a, 515 b is joined to loft axis section 537 a, 537 b. The length of one of the said rods may be modified by changing the relative angle between club head face 506 a, 506 b and loft axis section 537 a, 537 b, thereby changing loft angle 509 a, 509 b.

In a preferred mode, adjustable loft mechanism 500 a, 500 b involves modifying rod length, as shown on FIGS. 23 and 28, by means of screw 516 a, 516 b whose orientation matches the axis of one of said rods. One end of screw 516 a, 516 b rotates on its axis without axial movement, held by a bearing 524 a, 524 b matching one of the pivot vertices. The opposite side of screw 516 a, 516 b rotates on its axis and moves axially in bearing nut 526 a, 526 b, matching the pivot vertex opposite.

Adjustable loft mechanism 500 a, 500 b comprises a rear head area. For adjustable-loft iron heads 302, the said area may comprise the rear of face 502 a and/or the face frame and/or sole 504 a. In the preferred mode, the said iron head area comprises the rear of face 502 a and part of sole 504 a, as shown on FIGS. 24-25. In another mode for adjustable-loft wood head 202, the rear head area may comprise the face frame 503 b and/or sole 504 b and/or shell 505 b. The rear of face is not suggested in this mode as it is preferable for the face to perform elastically during impact with the ball. In the preferred mode, the said wood heads area comprises the face frame 503 b and principally the inner surface of sole 504 b, as shown on FIGS. 29-30.

One end of screw 516 a, 516 b comprises a smooth cylindrical section 517 a, 517 b rotating in radial bore 525 a, 525 b perforated on the surface of bearing cylinder 524 a, 524 b. The other end comprises a threaded section 518 a, 518 b screwed into female threaded radial bore 527 a, 527 b in bearing nut cylinder 526 a, 526 b, as shown in FIGS. 23 and 28.

Bearing cylinder 524 a, 524 b is a pivot vertex whose axis is perpendicular to the axis of screw 516 a, 516 b and parallel to the normal defining the plane containing adjustable loft mechanism 500 a, 500 b, with screw 516 a, 516 b prevented from axial movement.

In a preferred mode, screw 516 a, 516 b is attached to bearing cylinder 524 a, 524 b by means of washer 522 a, 522 b, nut 523 a, 523 b and thread 521 a, 521 b at the end of smooth cylindrical section 517 a, 517 b. Other attachment modes could include rivets, pins, snap rings, etc.

Bearing nut cylinder 526 a, 526 b is another consecutive pivot vertex whose axis is perpendicular to the axis of screw 516 a, 516 b and also parallel to the normal defining the plane containing adjustable loft mechanism 500 a, 500 b. At the same time, the normal defining the plane containing adjustable loft mechanism 500 a, 500 b is parallel to loft axis section 537 a, 537 b.

Joined connecting rod 540 a, 540 b is a fixed-length link matching second connecting rod 515 a, 515 b.

For an adjustable-loft iron head 302, the preferred configuration comprises bearing nut cylinder 526 a as first vertex pivot 511 a and is connected to the rear head area. Bearing cylinder 524 a corresponds to third vertex pivot 513 a and is connected to joined connecting rod 540 a and, by means of the opposite end of said rod, is attached to loft axis section 537 a at second joint vertex 512 a. In this case, the rear head area corresponds to the rear of face 502 a, as shown on FIGS. 21 and 24-25.

For an adjustable-loft wood head 202, the preferred configuration is that bearing cylinder 524 b corresponds to first vertex pivot 511 b and is connected to the rear head area. Bearing nut cylinder 526 b corresponds to third vertex pivot 513 b and is connected to joined connecting rod 540 b, which corresponds to second connecting rod 515 b, and by means of the opposite end of said rod, is attached to loft axis section 537 b at the second joint vertex 512 b. In this case, the rear head area corresponds to head sole 504 b, as shown on FIGS. 26 and 29-30.

For both configurations, screw 516 a, 516 b comprises a concentric joint dial 519 a, 519 b players can rotate with their fingers, as shown on FIGS. 23 and 28.

For adjustable-loft wood heads 202, dial 519 b is at the top of screw 516 b and above the first vertex pivot 511 b Said dial 519 b shows through shell 505 b, with a perforation in shell 554 b as the preferred solution, as shown on FIGS. 26 and 30.

For any head type in the above preferred modes, as shown on FIGS. 24, 25 and 29-30, adjustable loft mechanism 500 a, 500 b rotates in loft axis section 537 a, 537 b on three concentric pivot brackets whose axis is parallel to the horizontal of the head and stands in the rear head area. These are:

a) The first pivot bracket, i.e., loft axis pivot bracket 529 a, 529 b, near heel side 508 a, 508 b. b) A second pair of pivot brackets, i.e., second vertex pivot brackets 530 a, 530 b, near toe side 507 a, 507 b, hold second joint vertex 512 a, 512 b and second connecting rod 515 a, 515 b joined to loft axis section 537 a, 537 b, guiding their rotation. Toe side 507 a, 507 b is understood as the horizontal end of club head face 506 a, 506 b farthest from the shaft. c) The pair of second vertex pivot brackets 530 a, 530 b and loft axis pivot bracket 529 a, 529 b, and therefore loft axis section 537 a, 537 b, stand preferably at the bottom of the head, near sole 504 a, 504 b, in order to keep a low center of gravity.

An additional pair of first vertex pivot brackets 531 a, 531 b hold first vertex pivot 511 a, 511 b and are joined to the rear head area.

In joined connecting rod 540 a, 540 b, a pair of third vertex pivot brackets 541 a, 541 b hold third vertex pivot 513 a, 513 b in any configuration, including bearing cylinder 524 a or bearing nut cylinder 526 b. The first preferred configuration is for adjustable-loft iron heads 302 and the second for adjustable-loft wood heads 202.

Still in the preferred mode as shown on FIGS. 25 and 30, adjustable loft mechanism 500 a, 500 b comprises that joined connecting rod 540 a, 540 b is attached to loft axis section 537 a, 537 b, going through the latter in a male shape 538 a, 538 b and at right angles to the axis of said joined connecting rod 540 a, 540 b through the end matching second joint vertex 512 a, 512 b. Relative rotation is avoided by means of a cotter pin comprising an eccentric pin 539 a, 539 b parallel to loft axis section 537 a, 537 b, sharing the radial perimeter of said guide pin 539 a, 539 b between loft axis section 537 a, 537 b and joined connecting rod 540 a, 540 b. Said guide pin 539 a, 539 b is confined to the width of joined connecting rod 540 a, 540 b and between second vertex pivot brackets 530 a, 530 b. Axial movement can also be avoided through split pins or interference locks, albeit the final method will be determined by the financially viable manufacturing process.

Loft axis section 537 a, 537 b avoids axial head movement by means of snap ring 544 a, 544 b attached to loft axis section 537 a, 537 b and supported on the inner face of loft axis pivot bracket 529 a, 529 b. Loft axis section 537 a, 537 b also abuts second vertex pivot bracket 530 a, 530 b, closest to toe side 507 a, 507 b.

In the preferred mode, adjustable loft mechanism 500 b comprises, for adjustable-loft wood heads 202 on the outer surface of face frame 503 b on heel side 508 b, a heel concavity 553 b partially housing hosel section 533 b. Heel concavity 553 b has the required play to allow movement of hosel section 533 b, allowing for loft angles for the range of heads corresponding to the adjustable head, as shown on FIGS. 29-30.

Head Interchange Mechanism.

Head interchange mechanism 170, FIGS. 10-11, comprises pin lock 173, internal interchange cylinder 177 and external interchange cylinder 186, all sliding against each other. Internal interchange cylinder 177 houses pin lock 173. Internal interchange cylinder 177 is joined to shaft head interchange section 161. Internal interchange cylinder 177 and external interchange cylinder 186 can be of various concave and/or convex geometries, such as hexagons.

Pin lock 173 is permanently installed in hollow cylindrical protrusion 198 of standard hosel 199 and is thus joined to fixed loft head 201, 301, 401. In other words, said pin lock can be configured to be properly installed in any commercially-available fixed-loft angle head to turn it into an interchangeable head. Players can choose an existing commercial fixed-loft head 201, 301, 401 with a standard hosel 199 and use pin lock 173 instead, affixed the same way as a standard commercial shaft, i.e., using adhesives, as shown on FIGS. 14-16.

Pin lock 173 may also be permanently installed in female hosel protrusion 534 a, 534 b of hosel section 533 a, 533 b and thus joined to adjustable loft heads 202, 302, as shown on FIGS. 25 and 30. Optionally, pin lock 173 may be replaced by male hosel protrusion 535 a, 535 b compatible with head interchange mechanism 170, formed during manufacture of hosel loft axis 532 a, 532 b and equivalent to pin lock male protrusion 174 rising from hosel section 533 a, 533 b or standard hosel 199, as shown on FIGS. 25 and 30.

Pin lock male protrusion 174 rising from hosel section 533 a, 533 b or standard hosel 199 has torque-resistant geometry. The geometry of the inner surface of internal interchange cylinder 178 matches the geometry of the outer surface of pin lock male protrusion 174.

Internal interchange cylinder 177 houses in surface radial bores 182 at least one lock element 183.

Pin lock male protrusion 174 includes on its surface at least one pin lock dent 175 housing lock elements 183.

In coupled position 171, FIG. 12, lock elements 183 slide radially to be confined in pin lock dents 175, said radial bores 182, and the inner surface of external interchange cylinder 187.

In uncoupled position 172, FIG. 13, player slides external interchange cylinder 186 through decoupling recesses 188 on the inner surface of external interchange cylinder 187, allowing lock elements 183 to radially slide, releasing them from pin lock dents 175.

Pin lock male protrusion 174 disposes a smaller end section that is inserted into internal interchange cylinder 177 and expands into hosel section 533 a, 533 b or standard hosel 199. Said pin lock male protrusion 174 is a concave or convex polygon with at least a distinctive geometry enabling unique assembly orientation. Pin lock hosel protrusion 176 inserted into hosel section 533 a, 533 b or standard hosel 199 has a hollow cylindrical geometry of such size as to allow attachment by traditional methods of a standard shaft to hosel section 533 a, 533 b or standard hosel 199.

Pin lock 173 provides in pin lock hosel protrusion 176 inserted into hosel section 533 a, 533 b or standard hosel 199 the ability to use traditional attachment methods analogous or equivalent to those of the standard shaft replaced by pin lock 173, including contact cement, cured epoxy resin, locking sleeves, compression cones, interference locks, expansion joints, axial clamping screws, side clamping screws, bolted or riveted joints and/or any technical equivalent.

In the preferred configuration, the convex polygon section comprising pin lock male protrusion 174 is defined as hexagonal. At least one hexagonal face has a distinctive geometry enabling a unique assembly position. Lock elements 183 are balls. Locking ball(s) 183 are emplaced in one or more conical, equidistant radial bores 182 in an area corresponding to a hexagonal section of the inner surface of internal interchange cylinder 178. Pin lock dents 175 are recessed semispheres of a diameter at their widest point not exceeding that of locking balls 183. Pin lock dents 175 are emplaced in hexagonal pin lock 173 and match the position of said radial bores 182 and thus of locking balls 183 when head interchange mechanism 170 is in coupled position 171; see FIG. 12.

Pin lock dents 175 provide a configuration alternative comprising an area whose geometry is a revolving circular section whose axis of rotation matches the pin lock axis and its widest section is of a size not exceeding that of locking balls 183. Internal interchange cylinder 177 houses on outer surface 179 coupling spring 184, which when extended pushes external interchange cylinder 186 into coupled position 171; see FIG. 12. The depressed coupling spring 184 pushes external interchange cylinder 186 into uncoupled position 172; see FIG. 13. Player motion on external interchange cylinder 186 and thus on coupling spring 184 may be axial, torsion, or a combination thereof.

Head interchange mechanism 170 may optionally include decoupling spring 185 at the bottom of internal interchange cylinder 177 which remains depressed against the tip of pin lock male protrusion 174 when in coupled position 171, FIG. 12.

Head interchange mechanism 170 may include guide pin 181 traveling on guide slot 180, limiting travel of external interchange cylinder 186. Said guide pin 181 is joined to and passes through external interchange cylinder 186. Said guide slot 180 of the width of guide pin 181 proceeds in lengthwise recess parallel to the axis and over the outer surface of internal interchange cylinder 177.

For examples 1-2 above, pin locks 173 are incorporated into commercially available fixed-loft angle heads: putter 401 and 1-wood or driver 201. As the internal size of standard hosel 199 may vary depending on commercial head type, appropriate pin lock sizes will have to be provided. For adjustable loft heads 202, 302, especially in hosel section 533 a, 533 b the option is male hosel protrusion 535 a, 535 b. Protrusions in versions pin lock male protrusion 174 and male hosel protrusion 535 a, 535 b, which is inserted into head interchange mechanism 170, always have the same size and thus allow interchanging fixed and adjustable loft heads on adjustable-length shaft 100 with head interchange mechanism 170.

There is no limitation to defining the external diameter inserted into standard hosel 199, FIGS. 14-16. At present, internal hosel diameters for fixed-loft iron heads 301 and different internal diameters for fixed-loft wood heads 201 are common. Both diameters can be provided for, which generates at least two types of pin lock 173. For fixed-loft putter heads 401 there is a wider range of standard hosels 199, in terms of size and configurations, which can be either male or female. In addition, some configurations require a pin lock 173 with offset. As such, the preferred pin lock configuration accommodating commercial fixed-loft putter heads 401 must be specifically designed for said head. However, such specific design only comprises pin lock hosel protrusion 176 to be inserted into standard hosel 199. In the preferred configuration, the size of pin lock male protrusion 174 inserted into head interchange mechanism 170 remains unchanged, allowing head interchange on a single or reduced number of adjustable-length shafts 100.

Telescoping Mechanism.

Telescoping mechanism 130, FIGS. 6-7, comprises internal telescoping cylinder 136 and external telescoping cylinder 133 sliding against each other. Internal telescoping cylinder 136 slides over adjustable-length section 163 and is joined to handle core 122 and thereby to handle 120. One or more lock radial bores 137 on the surface of internal telescoping cylinder 136 house at least one lock element 138. Internal telescoping cylinder 136 and external telescoping cylinder 133 can be of various concave and/or convex geometries, such as hexagons.

Discrete length positions 165 are developed by means of at least one shaft dent 165 on adjustment surface 168. Said dents house lock elements 138. The said adjustment surface has torque-resistant geometry.

In locked position 131, FIG. 8, lock element(s) 138 slide radially until confined in shaft dents 165, in the said lock radial bores 137, and in the inner surface of external telescoping cylinder 134.

In unlocked position 132, FIG. 9, player slides external telescoping cylinder 133 through unlock recesses 135 on the inner surface of external telescoping cylinder 134, allowing lock element(s) 138 to radially slide, releasing them from shaft dents 165.

Adjustment surface 168 includes a series of surface shaft dents 165 built as a continuous surface relative to surface of shaft 160. In other words, said dents do not cause abrupt discontinuity of surface material as they are not holes in the shaft.

If shaft 160 is built in composite material, shaft dents 165 of adjustment surface 168 include that the entire area around shaft dents 165, as well as the area comprising shaft dents 165, do not break fiber continuity. If shaft 160 is built in polycrystalline material such as steel, the entire area around shaft dents 165, as well as the area comprising shaft dents 165, do not break crystalline structure continuity.

A possible configuration is a shaft 160 of mixed materials. The body of shaft 160, in all sections, is built in composite material. However, to achieve increased hardness in the finish of outer adjustment surface 168, this section is built using a thin sheet of material harder than the composite, such as steel, attached to the inner composite material layers. In fact, a preferred configuration has the said harder sheet covering only the outer surface part containing the sequence of shaft dents 165, FIG. 4.

Adjustment surface 168 includes at least one discontinuity as a guide slot for telescoping mechanism 130. Such discontinuity has torque-resistant geometry. In particular, the guide slot may be at least a flat surface 164 or U- or V-shaped relative to the shaft surface. The inner surface of internal telescoping cylinder 139 matches said adjustment surface 168.

In the preferred configuration, adjustment surface 168 has a circular section and another section made up of two opposing, 180° flat surfaces 164, FIG. 4. The flat surfaces house shaft dents 165. Dents may be recessed semispheres in opposing, 180°-pairs located on the opposing flat surfaces. As such, lock elements 138 are spheres whose radius matches said dents.

In a preferred configuration, said opposing flat surfaces 164, FIG. 4, housing shaft dents 165 may on their outer surface and thus on their surface finish be built in individual sheets of thin polycrystalline material such as steel and affixed to the composite body of shaft 160. Construction of said sheets of crystalline structure material includes shaft dents 165.

Internal telescoping cylinder 136 houses on its outer surface lock spring 142, which when extended pushes external telescoping cylinder 133 into locked position 131, FIG. 8. When depressed, lock spring 142 pushes external telescoping cylinder 133 into unlocked position 132, FIG. 9. Player motion on external telescoping cylinder 133 and thus on spring 142 may be axial, torsion, or a combination thereof.

Internal telescoping cylinder 136 includes position radial bore 144 containing position ball pointer 140 partially entering shaft dents 165. The ball is radially pressed against the shaft by means of ring-type spring 141 covering said ball 140 and the outer surface of said internal telescoping cylinder 136.

Internal telescoping cylinder 136 includes travel stopper 143 for external telescoping cylinder 133. Said stopper is a small tab at the start of the outer surface of internal telescoping cylinder 136 that clicks into unlock recess 135 on the inner surface of external telescoping cylinder 134 and sets the limits of travel.

Shaft butt section 166 comprises shaft butt end 167, FIG. 4, which guides and constrains maximum length of telescoping handle 110.

Using the Compact, Configurable Golf Club Set.

Prior to shot play, player selects an interchangeable head 200, 300, 400 and adjustable-length shaft 100; the latter when the compact club set includes more than one shaft, as described in example 2, FIG. 2. Steps to assemble the desired club are:

First: Player connects selected interchangeable head 200, 300, 400 to adjustable-length shaft 100 by means of head interchange mechanism 170. This may require disconnecting a head previously coupled to selected shaft. Said mechanism allows for replacing said heads by sliding external interchange cylinder 186 from coupled position 171, FIG. 12, to uncoupled position 172, FIG. 13. Second: For an adjustable-loft head 202, 302, player can regulate loft angle 509 a, 509 b by turning dial 519 a, 519 b in adjustable loft mechanism 500 a, 500 b. Third: Player extends or retracts adjustable-length shaft 100 by means of telescoping mechanism 130 in telescoping handle 110. Using his fingers, player moves external telescoping cylinder 133 from locked position 131, FIG. 8, to unlocked position 132, FIG. 9. Player slides said handle over adjustable-length section 163 to the desired position and locks the handle to the shaft. Fourth: Player checks club configuration and horizontal rest of attached head by placing the sole on the ground in striking position in front of the ball.

The order of steps two and three above is interchangeable.

CITATION LIST

The literature on patents and applications totally or partially addressing the scope of this invention is extensive. Our prior art review focuses on patents that have attempted to address issues in a comprehensive manner and on mechanisms most closely resembling this invention.

Patent Literature

-   U.S. Pat. No. 7,207,897 Golf Club Head and Shaft Connector and     Method -   U.S. Pat. No. 6,547,673 Interchangeable Golf Club Head and     Adjustable Handle System -   U.S. Pat. No. 5,083,779 Universal Golf Club Construction -   U.S. Pat. No. 4,253,666 Personal Golf Set For Par-3 Course -   U.S. Pat. No. 2,091,794 Golf Club

Below is a detailed review of said patents containing a brief description, a summary, a comparison to this invention, and a review of interference and inventive level of this invention relative to said patents.

U.S. Pat. No. 7,207,897 Golf Club Head and Shaft Connector and Method.

The invention disclosed in U.S. Pat. No. 7,207,897 proposes a connection mechanism enabling shaft and head interchange. The said patent discloses a device and method of assembly of a device allowing head interchange during club configuration. Use during game play is not intended.

Summary of U.S. Pat. No. 7,207,897.

Claims in U.S. Pat. No. 7,207,897 specifically comprise a connector to be used in club assembly containing a shaft, a head including an adapter and a connector comprising:

A shaft and first interchangeable connector assembly; A head assembly with a second interchangeable connector, sized to safely connect to the head adapter. The second connector includes a stop flange, extending radially outward to delimit the head adapter portion; First threads are formed in the first interchangeable connector and second threads in the second interchangeable connector, with first and second threads compatible for connecting the shaft and head assembly. Comparison of U.S. Pat. No. 7,207,897 and this Invention.

U.S. Pat. No. 7,207,897 addresses a technical issue limited to a head interchange mechanism operated prior to game play. It is not designed for use prior to each shot during game play.

Screw-on connectors pose the difficulty of having to concentrically align axes.

If U.S. Pat. No. 7,207,897 seeks to couple the said device during game play, it will result in an excessive delay incompatible with USGA rules 6 and 7.

In contrast, in the matter strictly related to connecting shaft and head, this invention does not use screw-on connectors since play may cause inadvertent release of the head and thus lead to delays.

Non-Interference Between U.S. Pat. No. 7,207,897 and this Invention.

U.S. Pat. No. 7,207,897 does not interfere with this invention as U.S. Pat. No. 7,207,897 is a particular solution concerning only shaft and head interchange. As to said mechanism, U.S. Pat. No. 7,207,897 provides a solution using screw-on connectors.

Inventive Level of this Invention with Respect to U.S. Pat. No. 7,207,897.

From elements disclosed in U.S. Pat. No. 7,207,897, a knowledgeable individual cannot deduce the components addressing connection of shaft to head that are disclosed in this invention. A condition of this invention is to allow for interchangeability during game play and not just during club configuration.

U.S. Pat. No. 6,547,673 Interchangeable Golf Club Head and Adjustable Handle System.

U.S. Pat. No. 6,547,673 describes a method for converting commercially available parts into an interchangeable golf club system. The system consists of two elements: the first is intended to be affixed to a standard head adapter to replace a standard shaft, while the second is an insert to be affixed to the bottom of the shaft.

The head and shaft inserts form a quick connector joining shaft and head. Any golf club can be emulated by using different heads representing the full range of woods, irons and putter type heads, each with a preinstalled head insert.

In addition, the invention describes a device to adjust shaft length by means of a pin installed at the top of the shaft which cooperates with a number of slots arranged in a telescoping sleeve that slides over the shaft.

While the invention in U.S. Pat. No. 6,547,673 is an approach to the technical issue in this invention, the elements detailed in this invention provide a solution that significantly reduces the number of heads by allowing for variable loft angles, a characteristic not included in U.S. Pat. No. 6,547,673.

Summary of U.S. Pat. No. 6,547,673.

In U.S. Pat. No. 6,547,673, the means of attachment used to obtain the claimed quick connector encompass a head insert with means for defining an axial slot extending axially along a portion of said head insert; and additional means for defining a circumferential slot extending circumferentially from the said axial slot and through which said head is connected to a shaft by sliding a shaft insert pin along said axial slot and rotating said shaft insert to move said pin along said circumferential slot. Said shaft insert further comprises a spring-loaded catch projecting radially outward from said shaft insert and means for defining a hole in said head insert for receiving a spring-action catch to selective non-rotatably lock said shaft insert to said head insert.

Comparison of U.S. Pat. No. 6,547,673 and this Invention.

U.S. Pat. No. 6,547,673 is only based on interchange of standard heads and shaft length variation, and adds no additional configuration characteristics such as loft angle variation. In order to emulate a conventional 14-club set, players must carry 14 heads in their reduced set. As such, only the number of shafts is reduced. Given partial reduction, desired advantages are also partial and thus the comparative advantages of this proposal are limited.

U.S. Pat. No. 6,547,673 claims a telescoping adjustment not discussed in detail except for the contents of the description and what can be surmised from accompanying figures. The described telescoping mechanisms are not recommended for manufacture. Slots in a telescoping tubular unit built from composite material lead to discontinuity in the mechanical properties of the shaft. Disrupting the fibers carrying mechanical loads and the high stress generated by slot-type geometries increase loads to unacceptable levels for such materials. This is also true of conventional materials such as steel.

The shaft has no locking mechanism keeping said shaft in the selected length position, and the way in which the pin locks into the slot hardly provides a secure connection capable of withstanding the impacts to which the shaft is subject during game play.

The quick connector claimed in U.S. Pat. No. 6,547,673 comprises a pin sliding through a slot and affixed to avoid rotation by a pin that remains in position by means of a spring or elastic force. As such, during game play there is the risk for turning forces on the connector to exceed the elastic force of the catch, allowing rotation of the mechanism and attendant head release. Due to this, the quick connector claimed in U.S. Pat. No. 6,547,673 poses an operating risk that may lead to an accident.

Non-Interference Between U.S. Pat. No. 6,547,673 and this Invention.

This invention and U.S. Pat. No. 6,547,673 disclose characteristics making them evidently different. U.S. Pat. No. 6,547,673 has weak telescoping and head interchange mechanisms and no loft angle mechanism. This invention is more dependable, as it uses mechanisms more reliably supporting the high mechanical loads the practice of golf imposes on mechanical components.

Inventive Level of this Invention with Respect to U.S. Pat. No. 6,547,673.

This invention discloses additional elements with respect to U.S. Pat. No. 6,547,673, such as loft angle adjustment, which cannot be inferred from the cited prior art as regards implementation and reliability.

U.S. Pat. No. 5,083,779 Universal Golf Club Construction.

The invention disclosed in U.S. Pat. No. 5,083,779 describes adjusting shaft length, loft angle, lie angle, weight, and impact face to produce various golf club configurations.

Summary of U.S. Pat. No. 5,083,779.

U.S. Pat. No. 5,083,779 claims a universal golf club comprising a shaft with top and bottom ends; an adjustable handle operationally associated with the top of the shaft; a head rotatably joined to the said element operationally affixed with respect to a first horizontal axis where the head comprises: a main body and a member with the impact face rotatably connected to said main body through a second horizontal axis extending through said main body and which is disposed generally perpendicular to the said first horizontal axis.

Comparison of U.S. Pat. No. 5,083,779 and this Invention.

U.S. Pat. No. 5,083,779 disposes a fixed head, which therefore does not allow adjusting for stroke type. For example, tee-offs with wood heads, shots onto the green with iron-type heads or hole shots with putter-type heads.

By disposing a head permanently joined to the shaft during game play, U.S. Pat. No. 5,083,779 implies that players, when adjusting shaft length, must also adjust the lie angle. As such, shaft adjustment involves two operations. This slows down the adjustment process and contravenes the spirit of the game, which values continuity between strokes.

The loft angle and lie angle mechanism is based on a toothed coupling. This requires decoupling, adjustment and coupling; in other words, three steps to change positions. A slow adjustment process contravenes the principle of continuity between strokes, USGA rules 6 and 7.

The toothed scheme has discrete positions that do not necessarily set the positions or angles desired by player for shot play.

Shaft adjustment by means of a pin results in a mechanism requiring tolerances incompatible with proper handling and with the feeling of a solid union, giving players the feel of a “loose” device.

Finally, weight adjustment by means of inserts in the back of the head is a slow, cumbersome operation that is impracticable between strokes.

Non-Interference Between U.S. Pat. No. 5,083,779 and this Invention.

In conclusion, U.S. Pat. No. 5,083,779 does not interfere with the innovation in this application as it does not consider all adjustment types described in this invention. Moreover, this invention addresses the technical issue by means of mechanisms that cannot be directly derived from the elements disclosed in U.S. Pat. No. 5,083,779.

Inventive Level of this Invention with Respect to U.S. Pat. No. 5,083,779.

With respect to U.S. Pat. No. 5,083,779, the basic design of this invention allows for unfettered head interchange, allowing for long shots by means of interchangeable woods, approach shots by means of interchangeable irons, or hole shots by means of an interchangeable putter.

In addition, this invention includes mechanisms whose basic design concept allows for extremely fast adjustment and/or coupling, very tight tolerances that avoid the “loose” feeling, and imitating a conventional club game for each adjusted position in the compact golf club set.

U.S. Pat. No. 4,253,666 Personal Golf Set for Par-3 Course.

The invention in U.S. Pat. No. 4,253,666 describes a golf club set consisting of a series of three heads to be assembled on a single two-section shaft. U.S. Pat. No. 4,253,666 includes a detailed description of a bag for transporting the said pieces.

Summary of U.S. Pat. No. 4,253,666.

Although this patent is oriented to describing the means of carrying a club set, in the document the means of attachment to obtain the quick connector encompass heads that substitute the hosel for pin locks with a pair of snap fin springs securing an axial connection and preventing rotation. Said pin locks are inserted into the shaft, which includes slots for insertion of connecting fin springs and attachment of head to shaft. U.S. Pat. No. 4,253,666 claims three head types: iron type for mid-distances, iron type for short distances, and a putter.

Claims also describe a shaft comprising two parts that are assembled using a version of the same axial connection mechanism comprising in one part fin springs that are inserted into slots on the other part of the shaft, thereby axially and rotationally attaching the two shaft parts.

Comparison of U.S. Pat. No. 4,253,666 and this Invention.

U.S. Pat. No. 4,253,666 is only based on head interchange, in principle limited to three heads. It does not offer shaft length variation and adds no additional configuration characteristics such as loft angle variation. Given these restrictions, U.S. Pat. No. 4,253,666 restricts its scope to a limited range of strokes. For example, it excludes woods strokes and notes that it is intended for a par-3 course.

Mechanisms consisting of a pair of axial attachment fin springs are not recommended for composite materials, as slots in the tubular unit cause discontinuity in the mechanical properties of the shaft. Disrupting the fibers carrying mechanical loads plus the high stress generated by slot-type geometries increase loads to unacceptable levels for such materials. This is also true of conventional materials such as steel, as fin springs must absorb important torque stresses generated in the fin base during club impact against the ball, shortening device life.

As U.S. Pat. No. 4,253,666 reduces the functionality of a standard club set, its advantages are limited.

Non-Interference Between U.S. Pat. No. 4,253,666 and this Invention.

This invention and U.S. Pat. No. 4,253,666 disclose characteristics that make them different. U.S. Pat. No. 4,253,666 is limited to including three heads, offers no shaft length adjustment mechanisms, and includes no head loft angle adjustment mechanisms. U.S. Pat. No. 4,253,666 bases its connection mechanisms on fin springs concentrating stresses on their base, thus limiting the type of construction materials that may be used and device life.

Inventive Level of this Invention with Respect to U.S. Pat. No. 4,253,666.

This invention discloses additional elements over U.S. Pat. No. 4,253,666, such as telescoping shaft adjustment and head loft angle adjustment which cannot be deduced from the cited prior art as regards implementation and reliability.

Mechanisms shown in this invention are rapidly adjusted, easily manipulated and above all sturdy, avoiding concentration of the important torque stresses generated by a stroke.

U.S. Pat. No. 2,091,794 Golf Club.

U.S. Pat. No. 2,091,794 describes a pivoting head joined to an axis including a toothed wheel on its end. A guide pin with a fixed toothed ending releases the toothed wheel and thus sets or enables regulating the head angle. The guide pin is part of a screw projecting from the inside of the shaft. Turning the screw from the shaft draws the guide pin closer to or away from the toothed wheel. A hollow pin lock houses the described mechanisms.

U.S. Pat. No. 2,091,794 describes a telescoping adjustment operating by means of a concentric tubular connection between shaft and handle.

Summary of U.S. Pat. No. 2,091,794.

In its principal claim, U.S. Pat. No. 2,091,794 literally describes a golf club comprising a head having a hollow stem and a blade and means for pivoting the blade about an axis parallel to the ground. Adjustment comprises a circular toothed member rigid with the blade and extending into the hollow shaft; a guide pin arranged inside the shaft having an angularly disposed toothed face adapted to be brought into engagement with said toothed member; means arranged inside of the stem for urging the guide pin out of engagement with said toothed member; a shaft threadedly engaging the hollow member and adapted to force the guide pin into engagement with the toothed member against the urging action of said means when said shaft is screwed a predetermined distance into the stem, said means urging the pin out of engagement with the toothed member when the shaft is unscrewed a predetermined distance to permit adjustment of the blade.

The head is described as a blade that can be hit on either face, enabling right- or left-hand use.

U.S. Pat. No. 2,091,794 describes a telescoping adjustment not detailed in claims, except for the contents of the description and what can be surmised from accompanying figures. The telescoping adjustment operates by means of a concentric tubular connection between shaft and handle. The shaft has recessed radial dents at regular intervals. The handle includes a toothed area and on its end a lip shaped to enable insertion into recessed dents. The lip is set or released by means of an internally threaded cylindrical piece that is screwed on the toothed handle area. To avoid handle rotation, the shaft has an axial recessed guide slot on its outer surface, while the handle has a recessed guide slot on its inner surface.

Comparison of U.S. Pat. No. 2,091,794 and this Invention.

Claims in U.S. Pat. No. 2,091,794 describe loft angle variation in an iron-type head, which intends to emulate the characteristics of all heads in a golf club set, including woods, irons, wedges, and putter.

The mechanism does not allow for head interchange, limiting player shots and potential. This invention enables head interchange, which solves basic issues such as balancing moment of inertia between clubs of varying lengths using heads of varying weights, adequate contact with the ground by means of soles designed with loft angle in mind, and more stable strokes through increased moment of inertia in wood and putter heads. This invention allows for head interchange, which ensures that the issues described are left to player discretion prior to shot play.

The head adjustment mechanism described in U.S. Pat. No. 2,091,794 is complex and thus subject to failure. Adjustment relies on a toothed area with a very small interference surface. Golf pieces are subject to significant torque, which when transmitted to smaller pieces generates significant stress levels that may lead to fracture and shorten device life.

U.S. Pat. No. 2,091,794 describes shaft length variation by means of a telescoping adjustment based on screwing a part onto the end of the handle.

A solution of the same screw-set/unscrew-release type is also proposed for head angle adjustment.

U.S. Pat. No. 2,091,794 involves adjusting the club prior to shot play through repeated actions implying unscrewing-releasing and screwing-setting into the desired angle and/or length. For 72 strokes, this is an extremely laborious proposition.

Mechanisms in this invention are designed to minimize the impact of position adjustment. While loft angle does operate by means of a screw, the screw always sets the loft angle, which avoids all releasing-setting issues.

In this invention, shaft length is adjusted by sliding an external ring placed along the handle. The ring sets the position and shaft length by means of a spring, thus minimizing manipulation.

Non-Interference Between U.S. Pat. No. 2,091,794 and this Invention.

This invention and U.S. Pat. No. 2,091,794 disclose completely different loft angle and shaft length adjustment mechanisms. This invention allows for head interchange, which is not considered in U.S. Pat. No. 2,091,794.

Inventive Level of this Invention with Respect to U.S. Pat. No. 2,091,794.

This invention discloses elements for the same purposes of U.S. Pat. No. 2,091,794, such as telescoping shaft and head loft angle adjustment, albeit performed differently and with improved reliability. This invention also incorporates rapid coupling mechanisms that can be used with any standard commercial head.

Mechanisms in this invention are rapidly adjusted, easily manipulated, and above all sturdy, avoiding concentration of the important torque stresses generated by a stroke. 

1. A compact golf club set configurable at player discretion prior to shot play, NOTED for comprising: At least adjustable-length shaft 100 in multiple discrete length positions 165 enabled by telescoping handle 110; said adjustable-length shaft 100 includes head interchange mechanism 170; At least interchangeable head 200, 300, 400 in adjustable-length shaft 100, with options for fixed loft heads 201, 301, 401 and adjustable loft heads 202, 302 incorporating adjustable loft mechanism 500 a, 500 b and sole 504 whose geometry 545 keeps said adjustable loft heads 202, 302 horizontal on the ground for each adjusted loft angle 509 a, 509 b; Interchangeable head means both fixed and adjustable loft types and/or combinations thereof: a) Wood heads 200: 1-wood or driver 210, fairway woods 220, and hybrids; b) Iron heads 300: 1- to 9-irons 310, 320 and wedges 330: pitch, gab, sand and lob wedges; and/or c) Putter head
 400. 2. A compact, configurable golf club set per claim 1, NOTED for at least adjustable-length shaft 100 configurable in multiple discrete length positions 165 enabled by telescoping handle 110 and head interchange mechanism 170 comprising: a) Shaft 160, which in turn comprises: a.1) Head interchange section 161 comprising head interchange mechanism 170 located at the head connector end; a.2) Adjustable-length section 163 defined by a constant cross-section which defines adjustment surface 168 and whose end comprises shaft butt section 166 used to attach shaft butt end 167; and a.3) Transition section 162 connecting head interchange section 161 to adjustable-length section 163; b) Telescoping handle 110, in turn comprising: b.1) Handle core 122, comprising a hollow, circular section tube such that its internal diameter matches the external diameter of shaft butt end 167 attached to the shaft butt section of shaft 166; b.2) Attached to one end of handle core 122 is locking/unlocking telescoping mechanism 130, where the locking function consists of at least one lock element 138 tightly entering one of multiple discrete length positions 165 on the surface of adjustable-length section 163; b.3) Also attached to handle core 122 is a rubber, leather or cork grip 121 by which player holds telescoping handle 110 and thus adjustable-length shaft
 100. 3. A compact, configurable golf club set per claim 1, NOTED for at least an interchangeable head 200, 300, 400 with adjustable loft mechanism 500 a, 500 b comprising: a) Club head face 506, 506 a, 506 b whose back supports adjustable loft mechanism 500, 500 a, 500 b during game play. b) Hosel loft axis 532 a, 532 b, comprising: b.1) Hosel section 533 a, 533 b connecting to adjustable-length shaft
 100. This is either a female hosel protrusion 534 a, 534 b or male hosel protrusion 535 a, 535 b. The latter is compatible with head interchange mechanism 170; b.2) Loft axis section 537 a, 537 b holding adjustable loft mechanism 500 a, 500 b; b.3) Offset section 536 a connecting loft axis section 537 a to hosel section 533 a on heel side 508 a; c) Modified sole geometry 545, with a scan section defined by at least three sections 550 where each contains a line along sole 552 cutting across the head volume. Each line is defined when the head rests horizontally 551 on the ground 549 in front of the ball, in position to contact club head face 506, for at least three adjusted loft angles, one intermediate loft angle 547 and two loft angle ends 548, corresponding to loft angles for the range of heads corresponding to the adjustable head.
 4. A compact, configurable golf club set per claim 3, NOTED for an adjustable loft mechanism 500 a, 500 b comprising: First vertex pivot 511 a, 511 b joined to the head body; Second joint vertex 512 a, 512 b matching and joined to loft axis section 537 a, 537 b; Third vertex pivot 513 a, 513 b corresponds to the intersection of first connecting rod 514 a, 514 b extending from the first vertex pivot 511 a, 511 b and second connecting rod 515 a, 515 b extending from second joint vertex 512 a, 512 b; Second connecting rod 515 a, 515 b joined to loft axis section 537 a, 537 b; and The length of at least one of said rods may be modified by changing the relative angle between club head face 506 a, 506 b and loft axis section 537 a, 537 b, thereby changing loft angle 509 a, 509 b.
 5. A compact, configurable golf club set per claim 4, NOTED for an adjustable loft mechanism 500 a, 500 b comprising that: Length of one of said rods can be modified by means of screw 516 a, 516 b whose orientation matches the axis of one of said rods; One end of screw 516 a, 516 b rotates on its axis without axial movement, held by a bearing 524 a, 524 b matching one of the pivot vertices; and The opposite side of screw 516 a, 516 b rotates on its axis and moves axially in bearing nut 526 a, 526 b, matching the pivot vertex opposite.
 6. A compact, configurable golf club set per claim 5, NOTED for an adjustable loft mechanism 500 a, 500 b comprising: A rear head area comprising the rear of face 502 a and/or face frame 503 b and/or sole 504 a, 504 b and/or shell 505 b, the latter to accommodate adjustable-loft wood heads 202; One end of screw 516 a, 516 b comprises a smooth cylindrical section 517 a, 517 b rotating in radial bore 525 a, 525 b perforated on the surface of bearing cylinder 524 a, 524 b; The other end comprises a threaded section 518 a, 518 b screwed into female threaded radial bore 527 a, 527 b in bearing nut cylinder 526 a, 526 b; Bearing cylinder 524 a, 524 b is a pivot vertex whose axis is perpendicular to the axis of screw 516 a, 516 b and parallel to the normal defining the plane containing adjustable loft mechanism 500 a, 500 b, with screw 516 a, 516 b prevented from axial movement; Bearing nut cylinder 526 a, 526 b is another consecutive pivot vertex whose axis is perpendicular to the axis of screw 516 a, 516 b and also parallel to the normal defining the plane containing adjustable loft mechanism 500 a, 500 b; The normal defining the plane containing adjustable loft mechanism 500 a, 500 b is parallel to loft axis section 537 a, 537 b; and Joined connecting rod 540 a, 540 b is a fixed-length link matching second connecting rod 515 a, 515 b.
 7. A compact, configurable golf club set per claim 6, NOTED for an adjustable loft mechanism 500 a, 500 b comprising: In a first configuration, bearing nut cylinder 526 a corresponds to first vertex pivot 511 a and is connected to the rear head area. Bearing cylinder 524 a corresponds to third vertex pivot 513 a and is connected to joined connecting rod 540 a and, by means of the opposite end of said rod, is attached to loft axis section 537 a at second joint vertex 512 a; In a second configuration, bearing cylinder 524 b corresponds to first vertex pivot 511 b and is connected to the rear head area. Bearing nut cylinder 526 b corresponds to third vertex pivot 513 b and is connected to joined connecting rod 540 b, which corresponds to second connecting rod 515 b, and by means of the opposite end of said rod, is attached to loft axis section 537 b at the second joint vertex 512 b; Screw 516 a, 516 b comprises a concentric joint dial 519 a, 519 b players can rotate with their fingers; and For adjustable-loft wood heads 202, dial 519 b is at the top of screw 516 b and above the first vertex pivot 511 b. Said dial 519 b shows through shell 505 b, with a perforation in shell 554 b as the preferred solution.
 8. A compact, configurable golf club set per claim 6, NOTED for an adjustable loft mechanism 500 a, 500 b comprising that: a) Loft axis section 537 a, 537 b rotates on three concentric pivot brackets whose axis is parallel to the horizontal of the head and stands in the rear head area: a.1) The first pivot bracket, i.e., loft axis pivot bracket 529 a, 529 b, is near heel side 508 a, 508 b; a.2) A second pair of pivot brackets, i.e., second vertex pivot brackets 530 a, 530 b, near toe side 507 a, 507 b, hold the second joint vertex 512 a, 512 b and second connecting rod 515 a, 515 b joined to loft axis section 537 a, 537 b, guiding their rotation; a.3) The pair of second vertex pivot brackets 530 a, 530 b and loft axis pivot bracket 529 a, 529 b, and therefore loft axis section 537 a, 537 b, stand preferably at the bottom of the head, near sole 504 a, 504 b; b) An additional pair of first vertex pivot brackets 531 a, 531 b hold first vertex pivot 511 a, 511 b and are joined to the rear head area; and c) In joined connecting rod 540 a, 540 b, a pair of third vertex pivot brackets 541 a, 541 b hold third vertex pivot 513 a, 513 b in any configuration, including bearing cylinder 524 a or bearing nut cylinder 526 b.
 9. A compact, configurable golf club set per claim 8, NOTED for adjustable an loft mechanism 500 a, 500 b comprising that: Joined connecting rod 540 a, 540 b is attached to loft axis section 537 a, 537 b by means of a male/female assembly; Loft axis section 537 a, 537 b inserts into second joint vertex 512 a, 512 b an end of its axis in a male shape 538 a, 538 b, at right angles to joined connecting rod 540 a, 540 b. Relative rotation is avoided by means of a pin comprising an eccentric pin 539 a, 539 b parallel to loft axis section 537 a, 537 b, sharing the radial perimeter of said guide pin 539 a, 539 b between loft axis section 537 a, 537 b and joined connecting rod 540 a, 540 b. Said guide pin 539 a, 539 b is confined to the width of joined connecting rod 540 a, 540 b between second vertex pivot brackets 530 a, 530 b; and Loft axis section 537 a, 537 b avoids axial head movement by means of snap ring 544 a, 544 b attached to loft axis section 537 a, 537 b and supported on the inner face of loft axis pivot bracket 529 a, 529 b. Loft axis section 537 a, 537 b also abuts second vertex pivot bracket 530 a, 530 b, closest to toe side 507 a, 507 b.
 10. A compact, configurable golf club set per claim 3, NOTED for an adjustable loft mechanism 500 b comprising, for adjustable-loft wood heads 202 on the outer surface of face frame 503 b on heel side 508 b, a heel concavity 553 b partially housing hosel section 533 b, allowing for loft angles of the range of heads corresponding to the adjustable head.
 11. A compact, configurable golf club set per claims 2 and 3, NOTED for a head interchange mechanism 170 comprising: Pin lock 173, internal interchange cylinder 177 and external interchange cylinder 186, all sliding against each other. Internal interchange cylinder 177 houses pin lock
 173. Internal interchange cylinder 177 is joined to shaft head interchange section
 161. Internal interchange cylinder 177 and external interchange cylinder 186 can be of various concave and/or convex geometries, such as hexagons; Pin lock 173 is permanently installed in hollow cylindrical protrusion 198 of standard hosel 199 and is thus joined to fixed loft head 201, 301,
 401. In other words, said pin lock can be configured to be properly installed in any commercially-available fixed-loft angle head to turn it into an interchangeable head. Pin lock 173 may also be permanently installed in female hosel protrusion 534 a, 534 b of hosel section 533 a, 533 b and thus joined to adjustable loft heads 202, 302; Pin lock male protrusion 174 rising from hosel section 533 a, 533 b or standard hosel 199 has torque-resistant geometry. The geometry of the inner surface of internal interchange cylinder 178 matches the geometry of the outer surface of pin lock male protrusion 174; Internal interchange cylinder 177 houses in surface radial bores 182 at least one lock element 183; Pin lock male protrusion 174 includes on its surface at least one pin lock dent 175 housing lock elements 183; In coupled position 171, lock elements 183 slide radially to be confined in pin lock dents 175, said radial bores 182, and the inner surface of external interchange cylinder 187; and In uncoupled position 172, player slides external interchange cylinder 186 through decoupling recesses 188 on the inner surface of external interchange cylinder 187, allowing lock elements 183 to radially slide, releasing them from pin lock dents
 175. 12. A compact, configurable golf club set per claim 11, NOTED for a pin lock male protrusion 174 disposing a smaller end section that is inserted into internal interchange cylinder 177 and expands into hosel section 533 a, 533 b or standard hosel
 199. Said pin lock male protrusion 174 is a concave or convex polygon with at least a distinctive geometry enabling unique assembly orientation. Pin lock hosel protrusion 176 inserted into hosel section 533 a, 533 b or standard hosel 199 has a hollow cylindrical geometry of such size as to allow attachment by traditional methods of a standard shaft to hosel section 533 a, 533 b or standard hosel
 199. 13. A compact, configurable golf club set per claim 12, NOTED for a pin lock 173 disposing in pin lock hosel protrusion 176 inserted into hosel section 533 a, 533 b or standard hosel 199 the ability to use traditional attachment methods analogous or equivalent to those of the standard shaft replaced by pin lock 173, including contact cement, cured epoxy resin, locking sleeves, compression cones, interference adjustment, expansion joints, axial clamping screws, side clamping screws, bolted or riveted joints and/or any technical equivalent.
 14. A compact, configurable golf club set per claim 11, NOTED for a head interchange mechanism 170 including hexagonal pin lock 173 comprising: Hexagonal pin lock male protrusion 174; At least one hexagonal face has a distinctive geometry enabling a unique assembly position; Lock elements 183 are balls; Locking ball(s) 183 are emplaced in one or more conical, equidistant radial bores 182 in an area corresponding to a hexagonal section of the inner surface of internal interchange cylinder 178; Pin lock dents 175 are recessed semispheres of a diameter at their widest point not exceeding that of locking balls 183; Pin lock dents 175 are emplaced in hexagonal pin lock 173 and match the position of said radial bores 182 and thus of locking balls 183 when head interchange mechanism 170 is in the coupled position.
 15. A compact, configurable golf club set per claim 14, NOTED for pin lock dents 175 providing a configuration alternative comprising an area whose geometry is a revolving circular section whose axis of rotation matches the pin lock axis and its widest section is of a size not exceeding that of locking balls
 183. 16. A compact, configurable golf club set per claim 11, NOTED for an internal interchange cylinder 177 housing on outer surface 179 a coupling spring 184, which when extended pushes external interchange cylinder 186 into coupled position
 171. The depressed coupling spring 184 pushes external interchange cylinder 186 into uncoupled position
 172. Player motion on external interchange cylinder 186 and thus on coupling spring 184 may be axial, torsion, or a combination thereof.
 17. A compact, configurable golf club set per claim 11, NOTED for head interchange mechanism 170 alternatively including decoupling spring 185 at the bottom of internal interchange cylinder 177, which remains depressed against the tip of pin lock male protrusion 174 when in coupled position
 171. 18. A compact, configurable golf club set per claim 11, NOTED for pin lock 173 being alternatively replaced by male hosel protrusion 535 a, 535 b compatible with head interchange mechanism 170, formed during manufacture of hosel loft axis 532 a, 532 b and equivalent to pin lock male protrusion 174 of previously described pin lock 173 rising from hosel section 533 a, 533 b or standard hosel
 199. 19. A compact, configurable golf club set per claim 11, NOTED for head interchange mechanism 170 alternatively including guide pin 181 traveling on guide slot 180, limiting travel of external interchange cylinder
 186. Said guide pin 181 is joined to and passes through external interchange cylinder
 186. Said guide slot 180 of the width of guide pin 181 proceeds in lengthwise recess parallel to the axis and over the outer surface of internal interchange cylinder
 177. 20. A compact, configurable golf club set per claim 2, NOTED for a telescoping mechanism 130 comprising: Internal telescoping cylinder 136 and external telescoping cylinder 133 sliding against each other. Internal telescoping cylinder 136 slides over adjustable-length section 163 and is joined to handle core 122 and thereby to handle
 120. One or more lock radial bores 137 on the surface of internal telescoping cylinder 136 house at least one lock element
 138. Internal telescoping cylinder 136 and external telescoping cylinder 133 can be of various concave and/or convex geometries, such as hexagons; Discrete length positions 165 are developed by means of at least one shaft dent 165 on adjustment surface
 168. Said dents house lock elements
 138. The said adjustment surface has torque-resistant geometry; In locked position 131, lock element(s) 138 slide radially until confined in shaft dents 165, in the said lock radial bores 137, and in the inner surface of external telescoping cylinder 134; In unlocked position 132, player slides external telescoping cylinder 133 through unlock recesses 135 on the inner surface of external telescoping cylinder 134, allowing lock element(s) 138 to radially slide, releasing them from shaft dents
 165. 21. A compact, configurable golf club set per claim 20, NOTED for an adjustment surface 168 including a series of surface shaft dents 165 built as a continuous surface relative to the surface of shaft
 160. In other words, said dents do not cause abrupt discontinuity of surface material as they are not holes in the shaft.
 22. A compact, configurable golf club set per claim 21, NOTED, if shaft 160 is built in composite material, for shaft dents 165 of the surface of adjustable-length section 163 including that the entire area around shaft dents 165, as well as the area comprising shaft dents 165, do not break fiber continuity. If shaft 160 is built in polycrystalline material such as steel, the entire area around shaft dents 165, as well as the area comprising shaft dents 165, do not break crystalline structure continuity.
 23. A compact, configurable golf club set per claim 22, NOTED for a shaft 160 of mixed materials, where the body of shaft 160, in all sections, is built in composite material. However, the outer surface of adjustment surface 168 is built using a thin sheet of material harder than the composite, such as steel, attached to the inner composite material layers. A variant has the said harder sheet covering only the outer surface part containing the sequence of shaft dents
 165. 24. A compact, configurable golf club set per claim 20, NOTED for an adjustment surface 168 including at least one discontinuity as a guide slot for telescoping mechanism
 130. Such discontinuity has torque-resistant geometry. In particular, the guide slot may be at least a flat surface 164 or U- or V-shaped relative to the shaft surface. The inner surface of internal telescoping cylinder 139 matches said adjustment surface
 168. 25. A compact, configurable golf club set per claims 21 and 24, NOTED for an adjustment surface 168 having a circular section and another section made up of two opposing, 180° flat surfaces
 164. The flat surfaces house shaft dents
 165. Dents may be recessed semispheres in opposing, 180°-pairs located on the opposing flat surfaces. As such, lock elements 138 are spheres whose radius matches said dents.
 26. A compact, configurable golf club set per claims 23 and 25, NOTED for the fact that opposing flat surfaces 164 housing shaft dents 165 may on their outer surface and thus on their surface finish be built in individual sheets of thin polycrystalline material such as steel and affixed to the composite body of shaft
 160. Construction of said sheets of crystalline structure material includes shaft dents
 165. 27. A compact, configurable golf club set per claim 20, NOTED for an internal telescoping cylinder 136 housing on its outer surface lock spring 142, which when extended pushes external telescoping cylinder 133 into locked position
 131. When depressed, lock spring 142 pushes external telescoping cylinder 133 into unlocked position
 132. Player motion on external telescoping cylinder 133 and thus on spring 142 may be axial, torsion, or a combination thereof.
 28. A compact, configurable golf club set per claim 20, NOTED for an internal telescoping cylinder 136 including position radial bore 144 containing position ball pointer 140 partially entering shaft dents
 165. The ball is radially pressed against the shaft by means of ring-type spring 141 covering said ball 140 and the outer surface of said internal telescoping cylinder
 136. 29. A compact, configurable golf club set per claim 20, NOTED for an internal telescoping cylinder 136 including travel stopper 143 for external telescoping cylinder
 133. Said stopper is a small tab at the start of the outer surface of internal telescoping cylinder 136 that clicks into unlock recess 135 on the inner surface of external telescoping cylinder 134 and sets the limits of travel.
 30. A compact, configurable golf club set per claim 2, NOTED for a shaft butt section 166 comprising shaft butt end 167, which guides and constrains maximum length of telescoping handle
 110. 31. Method for assembly of a club in the compact, configurable golf club set of claim 1, based on interchangeable head 200, 300, 400 with adjustable loft option 202, 302, NOTED for comprising the following steps to be performed by player prior to shot play: Connect said adjustable loft head 202, 302 to adjustable-length shaft 100 by means of head interchange mechanism 170; Adjust loft angle 509 a, 509 b of said adjustable loft head 202, 302; Extend or retract adjustable-length shaft 100 by means of telescoping mechanism 130 in telescoping handle 110; and Verify club configuration and horizontal rest of attached head by placing sole 504 on the ground in striking position in front of the ball.
 32. Method for assembly of a club in the compact, configurable golf club set of claim 1, based on interchangeable head 200, 300, 400 with fixed loft option 201, 301, 401, NOTED for comprising the following steps to be performed by player prior to shot play: Connect said fixed loft head 201, 301, 401 to adjustable-length shaft 100 by means of head interchange mechanism 170; Extend or retract adjustable-length shaft 100 by means of telescoping mechanism 130 in telescoping handle 110; and Verify club configuration and horizontal rest of attached head in striking position in front of the ball.
 33. Method for assembly of the compact, configurable golf club set in claims 11, 31 and 32, NOTED for the fact that the step of coupling interchangeable head 200, 300, 400 by means of head interchange mechanism 170 requires players to shift external interchange cylinder 186 from coupled position 171 to uncoupled position
 172. 34. Method for assembly of the compact, configurable golf club set in claims 7 and 31, NOTED for the fact that the step of adjusting loft angle 509 a, 509 b requires players to turn dial 519 a, 519 b in adjustable loft mechanism 500 a, 500 b.
 35. Method for assembly of the compact, configurable golf club set in claims 20, 31 and 32, NOTED for the fact that the step of extending or retracting adjustable-length shaft 100 requires players to shift external telescoping cylinder 133 from locked position 131 to unlocked position 132, sliding telescoping handle 110 over adjustable-length section 163 to the desired position and releasing said external telescoping cylinder 133 so it returns to locked position
 131. 